... ,DIN,JIS,etc. 4)ISO 9001:2008 SO(Slip On) flange Flange typeSO(Slip On) flangeThis flange is slipped over the pipe and ... ,etc.Surface Treatment Transparent oil, rust-proof black oil or hot galvanized.Usage:Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, ... ,Hebei Province,China Factory Certificate Test Equipment Production Equipment For sale PN 1.0 slip on carbon steel flange